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--- On Thu, 2/7/13, Goran Finnberg <[log in to unmask]> wrote: > > http://en.wikipedia.org/wiki/Passive_radiator_(speaker) > > " The weight of the cone of the passive radiator > should be approximately equivalent to the mass of > the air that would have filled the port which might > have been used for that design. " OK, THAT makes sense! I never got the impression that the passive cone was anything but a duplicate of the cone on the woofer.